Balanced slide-valve



(No Model.) Y

J. B. CONRAD. y BALANGBD SLIDE VALVE.

WlT 5655s.

UNITED STATES PATENT OFFICE.

JOHN B. CONRAD, or PORTLAND, OREGON.

BALANCED SLI DE-VALVE.

SPECIFICATION formingpart of Letters Patent No. 261,206, dated July 18, 1882.

Application filed March 16, 1882. (No model.)

To all whom, it may concern:

Be it known that I, JOHN B. CONRAD, a resident of the city of Portland, in the county of Multnomah, and State of Oregon, have invented certain new and useful Improvements in Balanced Slide-Valves, of which the following is a specification.

My invention relates to a slide-valve which is fitted with adjustable metal rings to act as steam-packing around the top of the valve and under the cover of steam-chest, the under side of these metal rings being adapted to tit upon the top of valve, which is also ot' corresponding shape to iit these metal rings.

rIhe object ot1 my invention is to construct a slide valve with suitable and necessary parts, arranged to work automatically by steam-pressure laterally, and form a steamtight packing against the steam-chest cover, and prevent vertical pressure of the steam upon the valve; and my invention consists, first, in constructing a slide-valve of circular formed chamber, open at top, and having its top chamfered oft from the upper and inner rim in the form of an inclined plane all around the top, there being a space intervening between the top ot' valve and the cover of steamchest; secondly, by placing on top ot'tl1is chamfered part ot' valve annular metal rings, which are cleft transversely, so as to come together and lessen their circle automatically when lateral pressure of steam comes against them, there being one inner and smaller ring and one outer and larger ring. The inner and lower side of each ring is chamfered oii' from the inside outward, so as to flt close and snug upon the corresponding chamfered shoulder ot' valve-top, and top surface ot the two rings forms a smooth surface, and is adapted to tit close against the upper seat formed on the cover of steam-chest and make a steam-tight flexible packing.

In the accompanying drawings, forming part of this specification, Figure l is a view in vertical Section of my invention. Fig. 2 is a view in transverse section ot" my invention, showing annular metal rings in position. Figs. 3 and 4 are enlarged views of the annular metal ring, showing the chamfered 'inside of each and where they are cleft; and Fig. 5 is a view in enlarged size, showing the slide-valve having chamt'ered top.

Ain Fig. l represents the steamchest. B represents the cover of same, having a. raised seat, a, on its under surface. C C represent the reception-ports. Drepresents the exhaust. E represents the slide-valve resting upon raised seat e. Slide-valve E, as shown in Figs. l and 5 at c c', is chamfered oft' at top, and is of circular form, the chamt'er extending all around its top from c to c', the outer surface of the chamfer being smooth and accurate in order to tit close and snug with the annular metal rings F F. (Shown in Figs. 1, 2, 3, and 4 ot' drawings.) V'lhese rings F Fare cleft or cut through transversely, so as to admit of lateral compression, the ring F being smaller than the other and fitting inside ot' ring F. The inner sides, ff', of rings F F' are chamfered oft, so as to correspond with and iit the chamfered part cc of valve E, and their top surface, d d', is smooth and accurate, so as to t np snug against seat a of cover B. g g' represent where each ring is cleft. This method of cutting the rings F F renders them ilexible and elastic to the lateral pressure of the steam, and is a very important feature of my invention.

The operation of my invention is as follows: The steam, entering steam-chest B, exerts a lateral pressure upon the rin gs evenly all round, which causes the rings to lessen their circles and brings them together. At the same time their upper surface comes up snug against seat a of cover B of steam-chest, and a tight steampackingis formed,which prevents any vertical pressure upon the valve. This operation is automatic, the rings, from their iiexible construction and arrangement, acting automatically from the lateral pressure, andthe chamfered edges preventing any escape of steam. The rings will rise a little with the pressure; but the snug tting of the ring and valve chamt'ers prevents any leak of steam to cause vertical pressure. I thus effect a very important and useful result by a simple and inexpensive arrangement upon the common slidevalve. I completely do away with any vertical pressure upon the valve and attain the successful construction and operation of an automatic balanced slide-valve.

IOO

Having described my invention,WhatI claim as new, and desire to secure by Letters Patent, 1s-

l. In a balanced slide-valve having a circular chamber, the inner and outer annular metal rings, cleft transversely, having inward chamfered bottom surfaces, and arranged with respect to each other so as to be steam-tight.

2. In a balanced slide-valve, the inner and outer annular meta-l rings, F F', cleft transversely, having inwardly chamfered bottom surfaces, and arranged with respect to each other so as to be steam-tight, in combination with a slide-valve having a chamfered top, c c, over which the bottom ot' each ring slides, operating substantially as herein shown.

and arranged With respect to cach other so as l to be steam-tight, seats a e, and steam-chest A, ope 1ating substantially as herein set forth.

JOHN B. CONRAD. Vitnesses:

W. H. ADAMS, D. l?. KENNEDY. 

